555 Quiz Buzzer
I see that FRIED posted a 555-based quiz buzzer. I would like to clarify where the connections are. From the schematic of the buzzer ciruit, it looks as though pin-7, C1 and R1 join to the 33K-line side of the 0.01uF cap on pin-2. I also think that the 0.01uF cap connects directly between pin-2 and the 33k-line, without connecting to the 10K-line which the schematic shows it crossing. I don't know - I don't think so, but I don't know. It's also a bit mystifying with the apparent common connection to the -ve (GND) for pin-1, one side of the buzzer and the -ve side of C1. I think this is supposed to be there.
Similarly on the switch circuits it looks as though there is a common connection between pin-6, pin-7, the 100k and the 33k-line. Or is this wrong. Maybe pin-6 is connected to the 100K and pin-7 is connected to the 33k-line. As per the buzzer circuit, I take it that the connection from pin-2 only connects to the 10K-line and not the 33k-line.
It would help to have big fat dots on each cross-connection to make it clear. Would you be able to provide a more clear circuit schematic please?
Thanks :?